the report project ee203(1)

8/10/2019 The Report Project EE203(1)

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King Fahd University of Petroleum and Minerals Electrical

Engineering epartment

EE203: ELECTRONICS IFall 2006

Semester 061

PROJECT REPORT:

AM Transmitter

Prepared For:

Dr. Mohammad A. Alsunaidi

Done By:

Ahmad Qutb Al-Deen ID: 232563

Saleh Naser Al-Mutawa ID: 235267

Section: 5

Tuesday 16 /1 /2007


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The Schematic:

As you can see the schematic of the project is in Figure 1:

Figure 1: The Schematic of the project

Design Description:The circuit is divided in to two parts:

1-

The amplifier: a Bipolar Junction Transistor (BJT) Common Emitter amplifier is

used to amplify the sound signal. The input sound signal is provided through the

base, and the output is received from the collector. The amplified signal is input

through the oscillator. This part is built around transistor Q2.

2-

The oscillator: which provide the carrier signal, which is the responsible of caring

the sound through the air to be received in any nearby receiver. And this part

includes Q1, inductor and a variable capacitor. The variable capacitor is used to

change the frequency of the carrier signal. Both inductor and capacitor are mainlyused to make the oscillation. Because of small problem faced in making the project,

the variable capacitor is replaced by constant capacitors. The approximated

frequency is about 25.25MHz.

Problem Faced:

Never will you see circuit design and its implementation with out error or problem faced.

And in this project we had agreed with these words as we saw some problems. The major

problem is the frequency, when having a deep look to the frequency it is clear that the


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frequency is high. The expected range of frequencies is between 500 kHz and 1600 KHz.

The most important difficulty that faced is having some components. Furthermore,

finding these components with the right values is another problem. Finding an inductorwith inductance 200H is out of accessibility in the time of implementing this project,

and this is not an ordinary inductor, there is a core has to be inside the coil of wires. After

finding the intended inductor, a proper capacitance should be there also.

The Circuit's Pictures:

Left: the circuit components. Right: the signal received by an oscilloscope.

An above view to the circuit.

Conclusion:

It was a good time to do job like this great project especially with this course that relate to

some of interesting things for us as two Computer Engineering Student (COE). And we


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really interest in the hardware component rather than Software. Also, we get the idea of

how did this AM Transmitter works. And how dose it could be implemented.

Other things are about how we analyze and test the work and the circuit to find the error

and the solution until finally it can be seen working.

If these analyses and descriptions are not enough, more descriptions and contact

information could be found in this website. (http://student.kfupm.edu.sa/s232563).

There is a wider range for creativity for those who like it. And this project could be an

example, but not a good example.

the report project ee203(1)

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